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countable and uncountable, plural inoculums or inocula
The active material used in an inoculation; an inoculant (i.e., a material or a dose thereof). quotations examples
Observers noted that Chinese variolators in Vietnam exhibited one or two slight variations in their practice, however, one constant factor is that they all introduced inoculum into the nasal passages.
2015, C. Michele Thompson, Vietnamese Traditional Medicine: A Social History, page 82